Representation of data — practice question

The diagram depicts the cross-section, taken through the centre of mass, of a uniform solid object. The object consists of a cylinder with radius $0.2\,\text{m}$ and length $0.7\,\text{m}$, from which a hemisphere of radius $0.2\,\text{m}$ has been cut away at one end. Point $A$ marks the centre of the plane face at the opposite end of the object. [$\text{The volume of a hemisphere is } \frac{2}{3}\pi r^3$ ]